CVE-2025-40669
📋 TL;DR
This vulnerability in TCMAN's GIM v11 allows unauthenticated attackers to modify user permissions via a specific POST request. Attackers can escalate privileges or disrupt access controls. All systems running vulnerable versions of TCMAN GIM v11 are affected.
💻 Affected Systems
- TCMAN GIM
📦 What is this software?
Gim by Tcman
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through privilege escalation to administrative access, enabling data theft, system manipulation, or service disruption.
Likely Case
Unauthorized privilege escalation allowing attackers to access sensitive data, modify configurations, or disrupt normal operations.
If Mitigated
Limited impact if proper network segmentation and access controls prevent exploitation attempts from reaching vulnerable endpoints.
🎯 Exploit Status
Exploitation requires sending a crafted POST request to a specific endpoint. No authentication is required based on the description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-tcman-gim-1
Restart Required: No
Instructions:
1. Monitor vendor channels for security updates. 2. Apply patches when available. 3. Test in non-production environment first.
🔧 Temporary Workarounds
Network Access Restriction
linuxBlock access to the vulnerable endpoint at network level
iptables -A INPUT -p tcp --dport [PORT] -m string --string "/PC/Options.aspx" --algo bm -j DROP
Web Application Firewall Rule
allAdd WAF rule to block requests to the vulnerable endpoint
WAF configuration: Block POST requests to /PC/Options.aspx with Command=2 parameter
🧯 If You Can't Patch
- Implement strict network segmentation to isolate TCMAN GIM systems from untrusted networks
- Deploy web application firewall with rules blocking access to /PC/Options.aspx endpoint
🔍 How to Verify
Check if Vulnerable:
Check if TCMAN GIM v11 is installed and accessible. Attempt to access /PC/Options.aspx?Command=2&Page=-1 endpoint (in controlled test environment only).Check Version:
Check application version through web interface or consult system documentationVerify Fix Applied:
After applying vendor patches or workarounds, verify that POST requests to /PC/Options.aspx?Command=2&Page=-1 no longer modify user permissions.📡 Detection & Monitoring
Log Indicators:
- POST requests to /PC/Options.aspx with Command=2 parameter
- Unusual permission changes in user accounts
- Access from unexpected IP addresses to administrative endpoints
Network Indicators:
- HTTP POST traffic to /PC/Options.aspx endpoint
- Traffic containing Command=2 parameter
SIEM Query:
source="web_server" AND url="/PC/Options.aspx" AND method="POST" AND params="Command=2"